December 2012 Windows Updates and DirectAccess Connectivity Issues

The December 2012 collection of Windows updates included a number of changes that may adversely affect connectivity for DirectAccess clients. The December updates included changes to the Windows Root Certificate store and a hotfix for the IP Helper Service. Either or both of these updates could potentially prevent DirectAccess clients from connecting via the IPHTTPS IPv6 transition protocol. For more information read this post from the Forefront UAG Product Team.